Friction-buffer.



J NICHOLS.

FRIGTION BUFFER.

APPLICATION FILED JUNE 7, 1909.

Patented Jal1.4, 1910.

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\ JosIAH NICHOLS, or LIMA, omo.

FRICTION-BUFFER.

Specicaton of Letters Tatent.

Patented Jan. 4, 1910.

Application ld June 7, 1909. Serial No. 500,473.

. This invention relates to friction buffers.

for the draw bars of railway cars and is especially designed as an improvement over the friction buffer shown and described `in Patnt N o. 865,054, granted to me Sept. 3rd, 190

i The principal objects of the invention are, rst to provide a greater friction surface so that the buffer may withstand a greater blow, second, to increase the strength of the barrel, third, to provide a buffer construction in which a gradually increasing frictional resistance 1s offered to the inward movement of the friction' blocks, and fourth,

to remove the blow from the follower lates and cause it to be borne by the friction blocks and barrel so that the former will not become bent.

lVith the foregoing and other objects in view, the invention consists of certain novel features of construction, combination and arran ement of parts, as will be more fully descri ed and articularly pointed out in the appended c aims.

In the accompanying drawings, Figure 1 is a central longitudinal section, partly in elevation of a friction buffer embodying my improvements; Figs. 2 and 3 are transverse sectional views taken on lines 2-2 and 3-3, respectively,` of Fig. 1; Fig. 4 is a horizontal section taken on line 4 4 of Fig. 1.

Referring to the drawings for a more particular description, the numeral 1 denotes a pair of longitudinal sills by which the buffer is attached to the car body,'said sills being provided, adjacent their ends, with spaced angle stops 2 for restricting the outward movement of the follower plates 3, the latter beingcarried by the strap oryoke 4 secured to the end of the draw bar 5.

Disposed between the follower plates 3 is a oneiece barrel A6 comprisin a cylindrical bo 7 and outwardly flare end portions 8. Svaid barrel is also provided with a plurality of longitudinal 'reinforcing ribs 9 which add increased strength and rigidity to the barrel. A pair of sliding' Lfriction blocks 10 are arranged in theflared portion at each end of the barrel and have their outer surfaces rounded to conform to the curvature of the flared end portionsof the barrel and tapered inwardly, as shown.

' The inner ends of the friction blocks are provided with the extensions 12 which are adapted to fit in the interior'of the body of the barrel. These extensions 12 are formed by suitably recessing the inner ends of the lfriction blocks, leaving shoulders 13 at the inner' ends of the extensions which are adapted to engage the end walls ofthe body. of the barrel and limit the inward sliding movement of said friction blocks. Thesev blocks are provided with flat inner surfaces 14 which are formed with sockets 15 to receive the opposite ends4 of the pressure springs 16' which force the rounded surface 11 of the friction blocks against the inner surfaces of the'flared end portions of the barrel. The outer ends of the friction blocks, as 17, are also flat and fit against the inner 'faces of the follower plates 3. A pair of circular bearing plates' 18 is arranged in opposite ends of the body of the barrel and are held against the inner ends of the friction blocks by a cushioning device, consisting of an outer coiled spring 19 which is arranged in the interior of the body of the lbarrel and a second similar spring 20.whicl1 is arranged concentrically within said outer spring.

By arranging the coiled springs 16 as shown, as the friction blocks move inwardly, theirv frictional engagement with the barrel will be increased. It is to be also' observed that the fiat outer ends of the friction blocks offer an additional frictional resistance to theonward movement thereof. Attention is also called to the fact that the barrel in my presentconstruction is of'much greater strength and rigidity than that shown in my patented construction and that the blow is borne by the shoulders 13 of the friction blocks instead of by the follower plates, and consequently there is no liability of the latter 'becoming bent when the blow is delivered. lit-.has been found that a friction block constructed in accordance with my invention is capable of absorbing a much greater blow-than any othery form which hasv connection with the accompanying drawings, the construction and operation of the invention will be readily understood without requiring a more extended explanation. Various changes in the form, proportion and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of the invention, as defined in the appended claims.

Having thus described my invention, what I claim is: l

1. A device of the class described comprising a'tubular barrel having outwardly flared end portions, a pair of friction blocks having rounded and inwardly beveled outer surfaces to conform with the inner surfaces of the iared vend portions of the barrel, a coiled spring to hold each set of blocks in frictional engagement with the inner surfaces of the barrel, and a cushioning device in the Barrel between the inner ends of the friction blocks.

2. A device of the class described comprising a tubular barrel having outwardly flared end portions, a pair of friction blocks having rounded and inwardly beveled outer surfaces to-conform with the inner surfaces risinga tubular barrel having outwardly ared end portions,v a pair of friction blocks having rounded and inwardly beveled outer surfaces to conform with the inner surfaces of the flared end port-ions of the barrel, a coiled spring to hold each set of blocks in frictional engagement with the inner surfaces of 'the barrel, a cushioning device in the barrel between the inner ends of the friction blocks, and shoulders formed at the inner ends of the blocks to limit their inward sliding movement.

.In testimony whereof I have hereunto set myhand in presence of two subscribing Witnesses.

JOSIAH NICHOLS. Witnesses D. M. AXLiNE, C. L. Fass. 

